Anons, I think I found something, but I don't know what it means. Could use some help..

Disregarding AM/PM, I searched every HH:MM in the Q posts. From 1:00 to 12:59. What I found is that there is at LEAST one Q post for every minute, EXCEPT for 4:31 and 6:27. But what I did find, is that there is a single post for both 4:31 & 6:27 in MM:SS (see pic).

I think the next step should be searching times while considering AM/PM? I don't know but this is no coincidence.